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OpenCloudOS-Kernel
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dm stripe: switch from local workqueue to system_wq 

kstriped only serves sc->kstriped_ws which runs dm_table_event().
This doesn't need to be executed from an ordered workqueue w/ rescuer.
Drop kstriped and use the system_wq instead.  While at it, rename
kstriped_ws to trigger_event so that it's consistent with other dm
modules.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Tejun Heo 2011-01-13 19:59:57 +00:00 committed by Alasdair G Kergon
parent d5ffa387e2
commit f521f074ab
1 changed files with 7 additions and 20 deletions
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27
drivers/md/dm-stripe.c
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@ -39,23 +39,20 @@ struct stripe_c {
struct dm_target *ti;
/* Work struct used for triggering events*/
struct work_struct kstriped_ws;
struct work_struct trigger_event;
struct stripe stripe[0];
};
static struct workqueue_struct *kstriped;
/*
* An event is triggered whenever a drive
* drops out of a stripe volume.
*/
static void trigger_event(struct work_struct *work)
{
struct stripe_c *sc = container_of(work, struct stripe_c, kstriped_ws);
struct stripe_c *sc = container_of(work, struct stripe_c,
trigger_event);
dm_table_event(sc->ti->table);
}
static inline struct stripe_c *alloc_context(unsigned int stripes)
@ -160,7 +157,7 @@ static int stripe_ctr(struct dm_target *ti, unsigned int argc, char **argv)
return -ENOMEM;
}
INIT_WORK(&sc->kstriped_ws, trigger_event);
INIT_WORK(&sc->trigger_event, trigger_event);
/* Set pointer to dm target; used in trigger_event */
sc->ti = ti;
@ -211,7 +208,7 @@ static void stripe_dtr(struct dm_target *ti)
for (i = 0; i < sc->stripes; i++)
dm_put_device(ti, sc->stripe[i].dev);
flush_workqueue(kstriped);
flush_work_sync(&sc->trigger_event);
kfree(sc);
}
@ -367,7 +364,7 @@ static int stripe_end_io(struct dm_target *ti, struct bio *bio,
atomic_inc(&(sc->stripe[i].error_count));
if (atomic_read(&(sc->stripe[i].error_count)) <
DM_IO_ERROR_THRESHOLD)
queue_work(kstriped, &sc->kstriped_ws);
schedule_work(&sc->trigger_event);
}
return error;
@ -401,7 +398,7 @@ static void stripe_io_hints(struct dm_target *ti,
static struct target_type stripe_target = {
.name = "striped",
.version = {1, 3, 0},
.version = {1, 3, 1},
.module = THIS_MODULE,
.ctr = stripe_ctr,
.dtr = stripe_dtr,
@ -422,20 +419,10 @@ int __init dm_stripe_init(void)
return r;
}
kstriped = create_singlethread_workqueue("kstriped");
if (!kstriped) {
DMERR("failed to create workqueue kstriped");
dm_unregister_target(&stripe_target);
return -ENOMEM;
}
return r;
}
void dm_stripe_exit(void)
{
dm_unregister_target(&stripe_target);
destroy_workqueue(kstriped);
return;
}